Slipper sole



FIG. 1 is a perspective view of the bottom and side of my new design;

FIG. 2 is a top plan view of my new design;

FIG. 3 is a bottom plan view of my new design;

FIG. 4 is an elevation view of the side of my new design;

FIG. 5 is an elevation view of the side of my new design;

FIG. 6 is an elevation view of the front of my new design; and,

FIG. 7 is an elevation view of the rear of my new design. 

The ornamental design for slipper sole, as shown and described. 